syscalls: syscall_threadexit

src/sys/syscalls/threadexit.c

@@ -0,0 +1,30 @@
+#include <kernel/syscalls.h>
+#include <kernel/sched.h>
+#include <arch/cls.h>
+#include <arch/spinlock.h>
+
+void syscall_threadexit(){
+	
+	thread_t* thread = arch_getcls()->thread;
+
+	proc_t* proc = thread->proc;
+
+	// this loop is required in order to prevent a race condition related to syscall_exit()
+	
+	spinlock_acquire(&proc->threadexitlock);
+
+	bool onlythread = true;
+
+	for(int i = 0; i < proc->threadcount; ++i){
+		if(proc->threads[i]->state != THREAD_STATE_DEAD && proc->threads[i] != thread){
+			onlythread = false;
+			break;
+		}
+	}
+	
+	if(onlythread)
+		syscall_exit(0); // if it is the only thread, use syscall_exit instead.
+		
+	sched_die();
+
+}